JP5650358B1 - Plate bending hollow roll manufacturing method, plate bending hollow roll and steel plate manufacturing process apparatus - Google Patents

Abstract

A plate bending process for bending a metal plate into a cylindrical shape is performed. Next, the butted left end surface 2a and the butted right end surface 2b of the metal plate 12 are subjected to temporary welding by spot welding or the like on the side surface of the butted portion 1. After that, a groove is provided on the inner peripheral side of both end portions that are abutted. Next, a matching process is performed on the butt portion 1 to form a uniform gap between both end faces. Next, the outer peripheral surface of the metal plate 12 after the alignment process is pressed by a pressing bolt equipped on the C-type fixing jig 7 to maintain a state where the gap is narrowed. Thereafter, laser beam welding is performed on the butt portion 1 by the laser beam welding apparatus 6a. Furthermore, the butt | matching part 1 is joined by performing high heat-input welding using a welding material, and the metal plate 12 bent into the cylindrical shape is formed in a cylindrical shape. As a result, it is possible to efficiently and efficiently reduce the plate bending hollow roll that enables the transfer of the steel sheet with high surface quality by eliminating the transfer of the roll surface shape to the steel sheet to be conveyed in a state where the production capacity of the facility is fully exhibited. Can be manufactured at low cost.

Description

  The present invention provides a plate bending hollow roll manufacturing method and a plate bending hollow roll that can be transported while maintaining a higher surface quality of the steel sheet in the steel sheet transporting process in the steel sheet manufacturing process, and that can reduce the manufacturing cost. And a steel plate manufacturing process apparatus.

In a steel plate manufacturing process, a large number of transport rolls are used to transport steel plates.
Among them, for a relatively large diameter roll, for the purpose of cost reduction, not a solid roll but a hollow roll in which a plate is bent and welded to form a cylindrical shape has been widely applied.

With the need for advanced surface quality of steel sheets, it is essential to transport the steel sheets while maintaining higher surface quality in the manufacturing process.
Previously, the roll surface shape may change due to continuous pressure or frictional load from the steel plate to be transported, which may cause cracking or peeling of the surface treatment layer. In some cases, the surface quality of the resin deteriorated. Therefore, it is necessary to increase the surface hardness of the hollow roll to reduce the change in the surface shape.

For this purpose, for example, measures have been taken such as using hard high carbon steel having a carbon equivalent of 0.45% or more and increasing the surface hardness by applying a heat treatment such as quenching.
However, when such a high-carbon steel roll base material is welded to the end face using a welding material on a plate bending process to form a hollow roll, defects such as cracks are present in the heat-affected part of the weld. Therefore, pre-heat treatment and post-heat treatment are required.

Therefore, in general, the welding material has a composition in which a low alloy component and a deoxidizing component are added in order to suppress quench hardening for the purpose of preventing weld cracking. For this reason, the hardness of the welded portion using the welding material tends to be lower than that of the roll base material, and it is difficult to uniformly apply the roll surface roughness in the roughness applying process necessary for the manufacture of the roll for conveyance. there were.
For example, when a welding material is used, the shot bites into the weld line portion in the surface roughness applying step by shot blasting, resulting in a large roughness. The rough roll surface roughness of the weld line may be transferred to the steel plate. In particular, in the high-grade surface-treated steel sheet that has been subjected to galvanization or the like, the transfer appears remarkably, which causes a product defect.
Furthermore, in order to avoid the transfer of the weld line, the tension of the steel plate tends to be set low, and this may cause meandering and slipping of the steel plate. That is, there has been a problem that the production capacity of the facility cannot be fully exhibited and the yield is reduced.

  In view of this, a manufacturing method for homogenizing the surface hardness of a plate-bending hollow roll has been conventionally provided. For example, Patent Documents 1 to 4 disclose such a method.

In the method described in Patent Document 1, a roll is manufactured by melt-bonding a roll base material itself with an electron beam or the like without using a welding material.
Further, in the method described in Patent Document 2, a roll is manufactured by joining roll base material end faces by a liquid phase diffusion bonding method.
Further, in the method described in Patent Document 3, a welding material is used, and after joining the end surfaces of the roll base material, the boundary line portion between the roll base material and the welding material is all scraped into a groove shape, and then the shaved groove is removed. I try to refill again.
Furthermore, in the method described in Patent Document 4, first, joining is performed by high heat input welding such as submerged arc welding, and then the outer peripheral surface of the welded portion and its periphery in order to eliminate the heat affected zone by high heat input welding. The side is excavated by gouging or the like and then refilled by low heat input welding such as plasma welding.

Japanese Patent Laid-Open No. 3-169212 Japanese Patent Laid-Open No. 9-300084 JP 2003-145207 A JP 2000-140912 A

In the method described in Patent Document 1 described above, it is necessary to correct the flat portion to a perfect circle after welding, which requires extra time and cost.
In addition, since electron beam welding is performed, there is a problem that work in a large-scale ultra-high vacuum facility is necessary, and the cost is high and workability is poor.
Furthermore, the joint end faces are abutted in parallel in a state where a flat shape is formed with the flat portions left without bending both end sides of the plate, but as described in Patent Document 4, Even if welding is performed by a laser beam, it is not easy to ensure a high-accuracy welded surface butt condition in terms of perpendicularity, linearity, and parallelism between the end surfaces in the end surface position formation state obtained in this way. There is a problem with. Moreover, it is necessary to solve the above-mentioned problem of correcting to a perfect circle.
In addition, even if the metal end face is machined before the metal plate is bent, the accuracy of the butt portion of the metal plate is reduced due to the distortion generated during the plate bending process, which is useful for laser beam welding. It becomes very difficult to ensure the required butt accuracy, and welding by laser beam welding becomes difficult.

  Moreover, the method of patent document 2 is performing the liquid phase diffusion joining by interposing an insert material between the end surfaces which faced. However, this bonding method makes it difficult to control defects, and advanced measures such as control of the bonding atmosphere and cleaning of the surfaces to be bonded are necessary to prevent the formation of inclusions such as oxides. In addition, it is not easy to make the structure of the insert material and the roll base material uniform, and discontinuity remains in the material structure after joining.

  Furthermore, the method described in Patent Document 3 uses a welding material to join, scrapes precipitates such as pro-eutectoid ferrite generated on the boundary line between the roll base material and the welding material into a groove shape, and low heat input welding. Therefore, it is made to backfill with weld metal. However, this method has the disadvantage that it requires further steps such as grinding and refilling after the joining operation, which requires time for manufacturing and increases costs.

  In addition, in the method described in Patent Document 4, as in the method described in Patent Document 3, joining is performed using a welding material, and the precipitate portion and the heat affected zone appearing on the outer surface of the roll are entirely covered. Cutting is performed, and the cut portion is again filled with weld metal by low heat input welding. Therefore, there is a disadvantage that more processes and time are required in a wider range than the grinding and backfilling range of Patent Document 3, and the cost is higher.

  The present invention solves the above-mentioned problems and eliminates the transfer of the roll surface shape to the steel plate to be transported in a state in which the production capacity of the equipment is sufficiently exerted, thereby enabling the transport of the steel plate with high surface quality. It aims at providing the manufacturing method of the plate bending hollow roll for manufacturing a bending hollow roll efficiently and at low cost, a plate bending hollow roll, and a steel plate manufacturing process apparatus.

  Further, when laser beam welding is applied, the butting accuracy of the butting surfaces is important. In particular, in the case of a thick plate, it takes a little time to secure the butting accuracy over the entire abutting surface. The present invention also solves this problem.

  In order to achieve the above object, the first invention is a state in which end surfaces of both end portions of the metal plate bent into the cylindrical shape are brought into contact with each other after the plate bending process for bending the rectangular metal plate into a cylindrical shape. In this state, groove processing is performed on the inner peripheral side of both end portions that have been butted to form a groove processing portion, and end surfaces on the outer peripheral side of the both end portions that have been butted are machined to smooth the end surfaces, and then In this state, a pressing force is applied to the cylindrical metal plate from the outer peripheral side to narrow the gap between the end faces of the both ends, and in this state without interposing a welding material between the end faces of the both ends, The both end portions of the metal plate are welded with a laser beam, and then welding is performed on the inner peripheral side groove processing portion using a welding material, thereby forming the cylindrical metal plate into a cylindrical shape. It is characterized by doing.

  According to a second aspect of the present invention, in the first aspect, the step of machining the end faces on the outer peripheral side of the abutted both ends forms a parallel interval between the end faces of the both ends. is there.

  Further, in a third invention according to the first invention, the step of machining the outer peripheral side end faces of the abutted both ends is in a state where the gap formed between the end faces of the both end portions is narrowed. In addition, the end surfaces of the abutted ends are formed in a tapered shape with the outer peripheral side opened so that the entire end surfaces of the ends are parallel.

  According to a fourth invention, in any one of the first to third inventions, the welding using the laser beam and the welding using the welding material are performed using an arm type robot.

  Further, in a fifth invention according to any one of the first to third inventions, the step of performing welding using a welding material on the groove processing portion on the inner peripheral side is a low heat input to the groove processing portion. The first weld layer is formed by welding, and the second weld layer is formed on the first weld layer by performing high heat input welding having a larger heat input than the low heat input welding to form the second weld layer. A welded part having a two-layer structure is formed in the pre-processed part.

  In the sixth aspect of the invention, the step of applying a pressing force from the outer peripheral side to the metal plate bent into a cylindrical shape to narrow the gap between the end faces of the both ends uses a fixing jig provided with pressing means. Then, the metal plate bent into the cylindrical shape is pressed from the outer peripheral side so as to narrow the gap between the end faces of the both end portions.

  Furthermore, 7th invention is the plate bending hollow roll manufactured using either of 1st-6th invention.

  Moreover, 8th invention is the steel plate manufacturing process apparatus which uses the plate bending hollow roll manufactured using either of the 1st-6th invention.

According to the first aspect of the present invention, the both end surfaces are machined after plate bending, thereby avoiding the roundness correction process as in the conventional method and matching with extremely high accuracy when matching the weld end surfaces. Can. Thereby, the direct welding between the roll base materials which does not require a welding material that causes a hardness difference, which has been difficult in the past, can be realized by high-precision laser beam welding.
Also, leave the height of the laser beam butt welded part on the inner surface side of the butt part so that the outer surface does not have a thermal effect, and then perform groove processing on both ends in advance, and the groove processed part By applying large heat input welding, which uses a welding material in general, the welding time can be remarkably shortened compared to a method of joining only by low heat input welding. For example, when welding a grooved portion by MIG welding or MAG welding as low heat input welding, it is necessary to weld about 30 times to build up the grooved portion. In the case of the submerged arc welding method, the welding time can be increased by approximately 10 times, so that the construction time can be shortened, and the associated cost reduction can be simultaneously achieved. In addition, by the groove processing, high butt accuracy can be ensured in the plate thickness direction over the entire butt surface, and there is an advantage that laser beam welding is easier to apply.
Therefore, it is not necessary to perform the cutting process of the welded part required due to the influence of the surface hardness difference as described above and the refilling process of the part, and laser beam welding without interposing the welding material. By making it possible to realize high-precision base metal fusion bonding at the surface, unevenness of the roughness after the final surface treatment is not generated, transfer of the roll surface shape to the steel plate is eliminated, and the production capacity of the equipment is sufficiently A sheet bending hollow roll that can be conveyed while maintaining a high surface quality of the steel sheet in the exhibited state can be produced efficiently and at low cost.

  Further, according to the second aspect of the present invention, the same effect as the first aspect described above can be obtained.

  In addition, according to the third aspect of the present invention, both ends when the gap is narrowed are formed so that the outer peripheral side is opened at the time of machining of the butt portion so that the parallel state with extremely high accuracy is obtained when pressed. It becomes possible to improve the adhesion degree of a surface, and can further improve the butting precision of a welding end surface.

  Furthermore, according to the fourth aspect of the present invention, by using an arm type robot in laser beam welding, the distance from the surface of the roll that needs to be adjusted depending on the material of the plate, the plate thickness, the roll diameter, etc., the laser beam It is possible to automatically change the parameters such as the incident angle of the welding head, the feed rate, and the laser intensity, and it is possible to improve the work efficiency by reducing the time and to reduce the manufacturing cost associated therewith.

  Further, according to the fifth aspect of the present invention, in order to further reduce the thermal influence on the outer surface of the roll, the first low heat input welding is used for welding to the grooved portion on the inner peripheral surface side. By forming the weld as a structure in which one layer is sandwiched and the second layer is formed by high heat input welding on the one layer, the heat effect from the high heat input welding to the outer peripheral surface of the roll can be further reduced, and the difference in roll surface hardness can be reduced. Further reduction can be realized.

  Furthermore, according to the sixth aspect of the present invention, it is possible to ensure high butt end accuracy of the metal plate during laser beam welding.

In addition, according to the present invention described above, there is no transfer to the steel sheet of the roll surface shape of the roughness non-uniformity due to the presence of the weld line intervening the welding material, it can be conveyed while maintaining the surface quality of the steel sheet high. The plate bending hollow roll which becomes possible can be manufactured efficiently and at low cost.
Therefore, sufficient line tension can be applied without worrying about transfer, enabling operation operation with full use of equipment production capacity in high-grade surface-treated steel sheets, and improvement in product yield.
Therefore, according to the seventh and eighth inventions of the present invention, it is possible to reduce and reduce the manufacturing cost and the maintenance cost when it is necessary to replace the transport rolls used in the steel sheet manufacturing process. Since the surface quality of the steel sheet can be maintained higher, it can be beneficially used in the steel industry.

It is explanatory drawing of the inner peripheral side groove | channel process of the butt | matching part in Example 1 of the manufacturing method of the plate bending hollow roll of this invention. It is explanatory drawing of the machining process of the butt | matching part in Example 1 of the manufacturing method of the plate bending hollow roll of this invention. It is explanatory drawing of the laser beam welding process by the C-type fixing jig in Example 1 of the manufacturing method of the plate bending hollow roll of this invention. It is explanatory drawing of the welding process of the groove part in Example 1 of the manufacturing method of the plate bending hollow roll of this invention. It is explanatory drawing of the laser beam welding process by the ring type fixing jig in Example 1 etc. of the manufacturing method of the plate bending hollow roll of this invention. It is explanatory drawing of the taper-shaped machining process in Example 2 of the manufacturing method of the plate bending hollow roll of this invention. It is explanatory drawing of the reference point of the taper angle in Example 2 of the manufacturing method of the plate bending hollow roll of this invention. It is explanatory drawing of the laser beam welding process by the arm type robot in Example 3 of the manufacturing method of the plate bending hollow roll of this invention. It is explanatory drawing of the 2 layer structure welding process by the ring type fixing jig in Example 4 of the manufacturing method of the plate bending hollow roll of this invention. It is an expansion schematic sectional drawing of the two-layer welding structure of the inner peripheral side of the plate bending hollow roll in Example 4 of the manufacturing method of the plate bending hollow roll of this invention. It is the figure which showed an example of the steel plate manufacturing process apparatus to which the plate bending hollow roll of this invention is applied.

  Embodiments of a method for producing a plate bending hollow roll and a plate bending hollow roll and a steel plate production process apparatus according to the present invention will be described below with reference to the drawings.

<First embodiment>
The 1st Example of the manufacturing method of the plate bending hollow roll of this invention is described using FIG. 1 thru | or FIG.

First, a plate bending process for bending a rectangular metal plate into a cylindrical shape is performed.
As the metal plate, stainless steel, chromium steel with enhanced hardenability or wear resistance, or chromium molybdenum steel can be used in addition to carbon steel.
The plate bending method may be a known method.

  Next, the butted left end surface 2a and the butted right end surface 2b of the cylindrical metal plate 12 subjected to the plate bending process are subjected to spot welding or the like on the butted portion 1 of the metal plate 12, preferably the side surface of the butted portion 1. Temporarily fix welding is performed to make a butt contact.

Thereafter, as shown in FIG. 1, groove processing is performed on the inner peripheral surface side of the butted left end surface 2a and the butted right end surface 2b after temporary fixing by a machining device 3c for inner surface groove processing provided with an end mill. The inner peripheral side groove processing portion 9 is formed.
The shape of the inner periphery side groove processing portion 9 formed by this groove processing is not limited to the V-shaped groove shape as shown in FIG. 1, and may be another similar shape such as a U-shape.
In addition, in FIG. 1, explanatory drawing of a groove processing process is shown.

  Thereafter, in this abutted state, a minimum thickness that can cut and remove the outer surface over the entire surface in the axial direction of the cylindrical metal plate 12 on a surface perpendicular to the line from the abutting portion 1 to the roll center. A rough cutting (reference surface) is performed.

  Next, as shown in FIG. 2, the machining apparatus 3 a provided with the straight-shaped end mill 3 a 1 is used to perform the alignment process from the outer peripheral surface side on the butt portion 1 after the inner peripheral groove processing, and about 10 mm. A gap having a uniform interval is formed. FIG. 2 is an explanatory diagram of the machining process of the butt portion 1.

In addition, the alignment process with respect to the butt | matching part 1 of the metal plate 12 by this machining apparatus is not limited to the machining by an end mill. In addition to the end mill, for example, a method such as simultaneous grinding of both end surfaces with respect to the butted left end surface 2a and the butted right end surface 2b by a cylindrical grindstone may be used.
In the present invention, the term “matching” refers to a machining step in which machining processing is simultaneously performed on the butted left end surface 2a and the butted right end surface 2b forming the butting portion 1 of the metal plate 12.
Furthermore, this machining step is preferably performed by end milling on the butting portion 1 described above. For example, each end surface is sequentially machined by an end mill or the like while the both end surfaces of the metal plate 12 are butted. You can also.

Next, a C-type fixing jig 7 is prepared.
The C-type fixing jig 7 includes pressing bolts (two pairs of upper pressing bolts 5a, two pairs of side pressing bolts 5b, and two pairs of lower portions) that are threadedly engaged with a threaded block 5d as shown in FIG. A plurality of C-shaped frames 5e provided with pressing bolts 5c) are provided in the roll axis direction.
Next, the plurality of frames 5e are arranged at a plurality of positions in the axial direction of the metal plate 12 after being combined in the previous machining step, and the outer peripheral surface side of the metal plate 12 bent into a cylindrical shape is set to each frame 5e. By pressing with the pressing bolts 5a, 5b, 5c, the butted left end surface 2a and the butted right end surface 2b are butted against each other to form the butted portion 1, and the state in which the gap is narrowed is maintained.
The gap of the butting portion 1 due to this pressing is adjusted to be as close to 0 as possible, with the gap narrowed to 0.8 mm or less, more preferably 0.5 mm or less.
FIG. 3 is an explanatory diagram of a laser beam welding process, which is the next process when fixed by the C-type fixing jig 7.

  Thereafter, laser beam welding is performed on the butt portion 1 by the laser beam welding device 6a in a state of being held by being pressed by the six pressing bolts (5a, 5b, 5c) of the C-type fixing jig 7 described above. The butt portion 1 is joined.

  Next, as shown in FIG. 4, it is turned upside down while being pressed and fixed by the above-described C-type fixing jig 7, and the welding head 10 is introduced into the groove processing portion 9 on the inner peripheral side. The groove welded portion 11 is formed and joined to the groove processed portion 9 by a general-purpose welding method using a welding material such as a submerged arc welding method, and a cylindrical metal plate 12 is formed into a cylindrical shape. To do.

Thereafter, the C-type fixing jig 7 is removed after the welding is completed.
In addition, although the case where a total of six pressing bolts 5a, 5b, and 5c in the C-type fixing jig 7 has been described, the number of pressing bolts is not limited to six, and the metal plate 12 after the matching processing is even from the outer peripheral surface side. It can be set to any number that can be pressed.
In addition, although the C-type fixing jig 7 has been described in the case where there are a plurality of frames 5e in the roll axis direction, the number of the frames 5e can be single in the roll axis direction.

Here, the fixing jig used to hold the metal plate 12 is not limited to the C-type fixing jig 7 as shown in FIG. 3, but may be a ring-type fixing jig 4 as shown in FIG. As shown in FIG. 5, the ring-type fixing jig 4 is a ring-shaped frame provided with pressing bolts (two pairs of upper pressing bolts 5a, two pairs of side pressing bolts 5b, and two pairs of lower pressing bolts 5c). A plurality of 5f are provided in the roll axis direction. FIG. 5 is an explanatory diagram of the laser beam welding process when the ring-type fixing jig 4 is used for fixing.
In this case, the laser beam welding head 6b of the laser beam welding device 6 is introduced into the inner surface side of the metal plate 12 machined from the butt portion 1, and welding is performed on the butt portion 1 from the inner surface side by a laser beam.
Further, although the welding direction is downward in FIG. 5, it may be upward.
The number of pressing bolts 5a, 5b, and 5c in the ring-type fixing jig 4 is not limited to six as shown in FIG. 5, and can arbitrarily press the metal plate 12 after being processed from the outer peripheral surface side. It can be made into the number of.
Moreover, although the ring-type fixing jig 4 has been described in the case where there are a plurality of frames 5f in the roll axis direction, the number of frames 5f can be single in the roll axis direction.

Next, a primary heat treatment for the purpose of material refining is optionally performed on the welded cylindrical metal plate 13. This primary heat treatment is intended to uniformly diffuse the hardening element carbon, etc., and release internal residual stress. For example, normalization, annealing, annealing / tempering, strain relief annealing, etc. It is done.
Next, the outer surface roughing of the cylindrical metal plate 13 and / or the rough adjustment of the roll diameter is optionally performed.
Next, a surface hardening heat treatment is performed. This surface hardening heat treatment is often performed by so-called induction hardening, and after hardening, tempering can be performed to obtain a tough surface hardening layer.

Thereafter, side plates and shafts are attached to both side surfaces of the cylindrical metal plate 13. The side plate and the shaft can be attached before the surface hardening heat treatment.
Next, roll diameter finishing of the cylindrical metal plate 13 is performed.
Finally, the final product, a plate-bending hollow roll, is completed through the adjustment of the roughness of the outermost layer of the roll surface of the cylindrical metal plate 13 and the construction such as hard chrome plating.

According to the first embodiment of the manufacturing method of the plate bending hollow roll of the present invention described above, after the plate bending process, the inner surface side of the abutting part is preliminarily subjected to groove processing on both ends, and the butting part is machined. Align and process. Therefore, even if a thick plate is used, the end faces to be welded can be abutted with extremely high accuracy, so that high-precision laser beam welding, which has been difficult in the past, can be joined.
In the direct welding between roll base materials by this laser beam, the weld line does not become a layer of different components, and high energy density welding can realize welding with few heat-affected portions and uniform surface hardness. Moreover, since there are few heat-affected parts of a welding line, it is possible to almost eliminate the cylindrical deformation after welding. Although a hardened layer temporarily appears in this weld line, it can be easily removed by a heat treatment in a subsequent process, the roll base material and the weld line have the same composition, and the same hardness is obtained in the final product.

In addition, as in the method described in Patent Document 1, welding is performed by abutting the joint end faces in parallel in a state where a special flat shape is formed so that both sides are kept flat by press molding or the like. Since it does not need to be performed, there is an advantage that an extra step for correcting the flat shape portion to a perfect circle after welding is unnecessary. Furthermore, unlike electron beam welding, there is an advantage that work in a large ultra-high vacuum facility is not required, and there is no problem of high cost and poor workability.
In addition, even if the metal end face is machined before the metal plate is bent, the accuracy of the butt portion of the metal plate is reduced due to the distortion generated during the plate bending process, which is useful for laser beam welding. It becomes very difficult to ensure the required butt accuracy, and welding by laser beam welding becomes difficult. On the other hand, in the first embodiment of the method for manufacturing a plate bending hollow roll of the present invention, by performing machining after plate bending, it is possible to ensure the butt accuracy required for laser beam welding, and to press from the outer peripheral side. Laser beam welding can be performed by applying a pressure and maintaining a state in which the gap between the end faces of both ends is narrowed.

  In addition, groove processing is performed on both ends of the butt portion in advance so that the height of the laser beam butt weld portion remains so as not to affect the outer surface on the inner surface side of the butt portion. By joining the processed parts by applying high heat input welding, the welding time can be remarkably shortened compared to the method of joining only by low heat input welding. For example, when welding a grooved portion by MIG welding or MAG welding as low heat input welding, it is necessary to weld about 30 times to build up the grooved portion. In the case of the submerged arc welding method, the welding time can be increased by approximately 10 times, so that the construction time can be shortened, and the associated cost reduction can be simultaneously achieved.

  Therefore, it is possible to suppress the deformation of the roll surface of the welded part over time and to form an even roughness with no difference in the hardness of the roll surface, and to fully demonstrate the production capacity of the equipment. It is possible to carry in the state. Therefore, the plate bending hollow roll which enables conveyance of the high-quality surface-treated steel sheet without transfer of the roll surface shape to the steel sheet to be conveyed can be produced efficiently and at low cost.

In addition, the fixing method of the metal plate 12 using temporary fixing welding at the time of the alignment process is one of the applicable methods, as long as the position of the end portion of the metal plate 12 subjected to the plate bending process is fixed. It is not related to this method.
As another fixing method, for example, the C-type fixing jig 7 is attached without performing temporary fixing welding, and the butted portion 1 is in a state where the butted left end surface 2a and butted right end surface 2b of the metal plate 12 are butted. Can also be machined. In this case, it is desirable to press and fix from the inner surface as required by means such as a hydraulic jack.

<Second embodiment>
A second embodiment of the method for producing a plate bending hollow roll of the present invention will be described with reference to FIGS.

First, in the same manner as in Example 1, a plate bending process for bending a rectangular metal plate into a cylindrical shape is performed. Then, spot welding or the like is performed on the butt portion 1 of the cylindrical metal plate 12, preferably the side surface of the butt portion 1, and temporary bonding is performed to obtain a butt state.
Next, as shown in FIG. 1, groove processing is performed on the inner peripheral surface side of the butted portion 1 after temporary fixing by a machining device 3 c equipped with an end mill.

Thereafter, using a machining apparatus 3b having a tapered end mill 3b1 as shown in FIG. 6, the matching process is performed on the butt portion 1 of the metal plate 12 to form a tapered gap having an interval of about 10 mm. To do.
Here, for example, as shown in FIG. 7, the taper-shaped angle θ is located on the opposite side in the circumferential direction from the midpoint of both end faces (2a, 2b) of the metal plate 12 opened at an interval of about 10 mm. The angle when the metal plate 12 is opened radially toward the both end faces (2a, 2b) of the metal plate 12 with reference to the point 8 at the center in the thickness direction is used as a reference.
Further, the taper shape in the present invention means both end faces when the gap between both end faces (2a, 2b) is narrowed when viewed from a direction perpendicular to the central axis of the cylindrical metal plate 12. (2a, 2b) A shape in which the outer peripheral surface side is open compared to the inner peripheral surface side so that the entire surface is parallel.
FIG. 6 is an explanatory view of a taper-shaped machining process, and FIG. 7 is an explanatory view of a reference point of the taper angle.

  Thereafter, in the same manner as in Example 1, the pressing bolts (5a, 5b, 5c) provided in the C-shaped fixing jig 7 as shown in FIG. And the butt | matching part 1 which performed the alignment process is made into the state which narrowed the clearance gap by press. Further, the butted portion 1 is joined by the laser beam welding device 6 while being fixed by the C-type fixing jig 7 and held by being pressed.

Next, as shown in FIG. 4, it is turned upside down while being pressed and fixed by the C-type fixing jig 7, and the welding head 10 is introduced into the inner peripheral side of the groove processing portion 9 on the inner peripheral side, and the submerging is performed. A groove weld portion 11 is formed and joined to the groove processing portion 9 by a general-purpose welding method using a welding material such as a dearc welding method.
After the welding is completed, the C-type fixing jig 7 is removed. The fixing jig may be a ring-type fixing jig 4 as in the first embodiment.
In addition, as in the first embodiment, the C-type fixing jig 7 or the ring-type fixing jig 4 is attached after using means such as a hydraulic jack from the inner surface as necessary, and the metal plate is not temporarily mounted. You may machine the butt | matching part 1 in the state which faced both end surfaces (2a, 2b) of 12.

Next, the cylindrical metal plate 13 after welding is subjected to arbitrary primary heat treatment for the purpose of material tempering, arbitrary outer surface roughing, rough adjustment of an arbitrary roll diameter, and surface hardening heat treatment.
After that, through the installation of side plates and shafts on both side surfaces of the cylindrical metal plate 13, roll diameter finishing processing, roughness adjustment of the outermost layer of the roll surface and hard chrome plating, etc., the plate bending hollow roll which is the final product is obtained. Finalize.

Also in the second embodiment of the method for manufacturing a plate bending hollow roll of the present invention, substantially the same effect as that of the first embodiment of the method for manufacturing a plate bending hollow roll described above can be obtained.
In addition, by forming the end face after the end processing of both ends of the metal plate 12 in a tapered shape with the outer peripheral side open, both ends when the gap between the end faces of the both ends of the metal plate 12 is narrowed. The entire end face of the part is parallel, and the abutting part 1 can be formed to be in a highly accurate parallel state when pressed, and the degree of adhesion of both end faces of the metal plate 12 when the gap is narrowed is improved. Therefore, it is possible to further improve the butting accuracy of the weld end face.

  The reference point of the taper-shaped angle θ is not limited to the point 8 in FIG. In addition, it can be set as an arbitrary point on the inner peripheral side with respect to the outer surface of the metal plate 12 shown in FIG. 7, and more preferably, an intermediate point between both end surfaces to be tapered and the metal plate 12 subjected to plate bending processing. It is desirable to set it as an arbitrary point in consideration of the thickness and diameter of the metal plate 12 on the line segment connecting the center.

<Third embodiment>
A third embodiment of the manufacturing method of the plate bending hollow roll of the present invention will be described with reference to FIG.
FIG. 8 is an explanatory diagram of a laser beam welding process by an arm type robot.

First, a plate bending process for bending a rectangular metal plate into a cylindrical shape is performed as in the first embodiment. Then, spot welding or the like is performed on the butt portion 1 of the cylindrical metal plate 12, preferably the side surface of the butt portion 1, and temporary bonding is performed to obtain a butt state.
Next, as shown in FIG. 1, groove processing is performed on the inner peripheral surface side of the butted portion 1 after temporary fixing by a machining device 3 c equipped with an end mill.
Further, using a machining device provided with a straight-shaped end mill 3a1 or a tapered end mill 3b1, a matching process is performed on the butt portion 1 of the metal plate 12, and the interval of about 10 mm is uniform or tapered. Create a gap.

Then, like Example 1 etc., using the press bolt (5a, 5b, 5c) with which the C type fixing jig 7 as shown in FIG. 3 and the ring type fixing jig 4 as shown in FIG. 5 were equipped, It presses from the outer peripheral surface of the metal plate 12 after a plate bending process, and hold | maintains the butt | matching part 1 which performed the alignment process, narrowing a clearance gap by press. The butted portion 1 is joined by the laser beam welding device 6 with the gap narrowed.
At this time, as shown in FIG. 8, laser beam welding is performed using an arm type robot 6.
In this case, first, a laser beam welding head 6a is provided at the tip of the robot arm 6c of the arm type robot 6, and various welding conditions for the metal plate 12 as a roll base material (plate material, plate thickness, roll diameter, etc.). The necessary setting values (for example, the distance from the roll surface, the incident angle of the laser beam welding head, the feed speed, the laser intensity, etc.) set in advance in accordance with the above are set. After that, an arm equipped with the laser beam welding head 6a described above is introduced to the outer surface side of the metal plate 12 or the inner surface side of the metal plate 12, and laser beam welding is performed.
When welding from the outer surface of the metal plate 12, the C-type fixing jig 7 shown in FIG. 3 is used, and when welding from the inner surface of the metal plate 12, the ring-type fixing tool 4 shown in FIG. 5 is used. It is desirable to do.
Thereafter, as shown in FIG. 4, it is turned upside down while being pressed and fixed by the C-type fixing jig 7, and welding such as a submerged arc welding method is performed from the inner peripheral side to the groove portion 9 on the inner peripheral side. A groove weld portion 11 is formed and joined to the groove processing portion 9 by a general-purpose welding method using a material.
After the welding is completed, the C-type fixing jig 7 is removed.

Next, the cylindrical metal plate 13 after welding is subjected to arbitrary primary heat treatment for the purpose of material tempering, arbitrary outer surface roughing, rough adjustment of an arbitrary roll diameter, and surface hardening heat treatment.
After that, through the installation of side plates and shafts on both side surfaces of the cylindrical metal plate 13, roll diameter finishing processing, roughness adjustment of the outermost layer of the roll surface and hard chrome plating, etc., the plate bending hollow roll which is the final product is obtained. Finalize.

Also in the third embodiment of the method for producing a plate bending hollow roll of the present invention, substantially the same effect as that of the first embodiment of the method for producing a plate bending hollow roll described above can be obtained.
In addition, by using an arm type robot in laser beam welding, the distance from the surface of the roll, the incident angle of the laser beam welding head, the feed rate, laser, etc. that need to be adjusted each time depending on the material of the plate, the plate thickness, the roll diameter, etc. It is possible to automatically change parameters such as strength, thereby improving work efficiency, reducing time, and reducing manufacturing costs associated therewith.

<Fourth embodiment>
A fourth embodiment of the method for producing a plate bending hollow roll of the present invention will be described with reference to FIGS.

First, in the same manner as in Example 1, a plate bending process for bending a rectangular metal plate into a cylindrical shape is performed. Then, spot welding or the like is performed on the butt portion 1 of the cylindrical metal plate 12, preferably the side surface of the butt portion 1, and temporary bonding is performed to obtain a butt state.
Next, as shown in FIG. 1, groove processing is performed on the inner peripheral surface side of the butted portion 1 after temporary fixing by a machining device 3 c equipped with an end mill.
Furthermore, using a machining device equipped with a straight-shaped end mill 3a1 or a tapered end mill 3b1, a matching process (about 10 mm interval) is performed on the butt portion 1 of the metal plate 12, and the interval of about 10 mm is uniform. A narrow or tapered gap is formed.

  Then, like Example 1 etc., using the press bolt (5a, 5b, 5c) with which the C type fixing jig 7 as shown in FIG. 3 and the ring type fixing jig 4 as shown in FIG. 5 were equipped, It presses from the outer peripheral surface of the metal plate 12 after a plate bending process, and hold | maintains the butt | matching part 1 which performed the alignment process, narrowing a clearance gap by press. The butted portion 1 is joined by the laser beam welding device 6 with the gap narrowed.

Next, as shown in FIG. 9, it is turned upside down while being pressed and fixed by the ring-type fixing jig 4, and low-heat-input welding (for example, MAG) using a welding material from the inner peripheral side to the groove processing portion 9. Overlay welding is performed by welding, MIG welding, electron beam welding method using a welding material, laser beam welding method using a welding material, plasma transfer arc welding method, or the like, to form the first weld layer 11a.
In the build-up welding that forms the first weld layer 11a, a low-carbon welding material with low quenching hardenability is used. Therefore, the carbon content is diluted (diffusion) by the fusion of the butt portion 1 and the low-carbon welding material. 10), the low heat input welding method such as MAG welding or MIG welding described above is used. Here, as described above, the welding material of the first weld layer 11a has a lower carbon content than the base material, and if the penetration into the butt portion 1 that becomes the base material and the hardened layer is increased, it is hardened by dilution (diffusion) by fusion. Since the layer depth may decrease, the welding conditions are such that the penetration into the base metal is suppressed to about 2 mm without fear of poor fusion (internal defects) (for example, 2-3 times by low heat input welding) It is desirable to use overlay welding).

Furthermore, high heat input welding using a welding material having a larger heat input than the welding at the time of forming the first welding layer 11a on the upper side of the first welding layer 11a (the inner peripheral side of the cylindrical metal plate 13) ( For example, overlay welding is performed by a submerged arc welding method, a carbon dioxide gas welding method, an electroslag welding method, or the like to form the second weld layer 11b.
In the build-up welding that forms the second weld layer 11b, a low-carbon welding material with low quenching hardenability is used as in the build-up welding that forms the first weld layer 11a. In the high heat input welding of the second weld layer 11b, the first weld layer 11a serves as a buffer layer. Therefore, even if the second weld layer 11b and the first weld layer 11a are fusion welded, the butt portion 1 The effect of reducing the influence on the is obtained.
By doing in this way, as shown in FIG. 10, the 1st welding layer 11a formed by the low heat-input welding using a welding material on the inner peripheral surface side of the metal plate 13, and the large insertion using a welding material The second weld layer 11b formed by heat welding is formed in the groove processing portion 9.

In addition, the process which forms and joins the groove part weld part 11 which consists of the 1st weld layer 11a and the 2nd weld layer 11b in this groove process part 9 is the welding method which is as low heat input as possible as a 1st weld layer. The first weld layer 11a is formed by the above-mentioned method, and then the second weld is formed on the upper (inner circumference) side of the first weld layer 11a by a general-purpose large heat input welding method having a larger heat input than when the first weld layer 11a is formed. What is necessary is just to form the welding layer 11b.
For example, low heat input welding is performed a plurality of times or a plurality of methods to form the first welding layer 11a, or large heat input welding is performed a plurality of times or a plurality of methods to form the second welding layer 11b. Is also possible.

  After the welding is completed, the C-type fixing jig 7 is removed.

Next, the cylindrical metal plate 13 after welding is subjected to arbitrary primary heat treatment for the purpose of material tempering, arbitrary outer surface roughing, rough adjustment of an arbitrary roll diameter, and surface hardening heat treatment.
After that, through the installation of side plates and shafts on both side surfaces of the cylindrical metal plate 13, roll diameter finishing processing, roughness adjustment of the outermost layer of the roll surface and hard chrome plating, etc., the plate bending hollow roll which is the final product is obtained. Finalize.

Also in the fourth embodiment of the method for manufacturing a plate bending hollow roll of the present invention, substantially the same effect as that of the first embodiment of the method for manufacturing a plate bending hollow roll described above can be obtained.
In addition, as welding to the grooved portion 9 on the inner peripheral surface side, first, a first welding layer (first welding layer 11a) of low heat input welding is formed, and a large heat input is formed on the first welding layer. By forming the second weld layer (second weld layer 11b) by welding, it is possible to further reduce the heat effect on the outer surface of the roll, and to reduce the heat effect on the outer peripheral surface during high heat input welding. It is possible to further reduce and realize further reduction of the difference in roll surface hardness.

<Fifth embodiment>
A fifth embodiment which is an embodiment of the plate bending hollow roll and the steel plate manufacturing process apparatus of the present invention will be described with reference to FIG.

FIG. 11 is a view showing an example in which a plate bending hollow roll manufactured by the method for manufacturing a plate bending hollow roll of the present invention exemplified in the first to fourth embodiments is applied to a steel plate manufacturing process apparatus. .
As shown in FIG. 11, in a steel sheet manufacturing process apparatus, mainly in CAL (Continuous Annealing Line), CGL (Continuous Hot Plating Line; Continuous Galvanizing Line), etc., especially in a diameter of 400 mm to 1500 mm. For the hollow roll R, the plate bending hollow roll manufactured by the method for manufacturing the plate bending hollow roll of the present invention exemplified in the above first to fourth embodiments is used.
In addition, the use place of the plate bending hollow roll manufactured with the manufacturing method of the plate bending hollow roll of this invention illustrated in the above-mentioned 1st-4th Example is limited to a steel plate manufacturing process apparatus as shown in FIG. Not.

According to the first to fourth embodiments of the manufacturing method of the plate bending hollow roll described above, the transfer of the surface roughness non-uniformity portion generated by the presence of the welding line intervening the welding material to the steel plate is eliminated, and the surface of the steel plate A plate-bending hollow roll that can be conveyed while maintaining high quality can be efficiently manufactured at low cost. This plate bending hollow roll is very suitable for the hollow roll for conveyance used in a steel plate manufacturing process.
Therefore, according to the fifth embodiment of the plate bending hollow roll and the steel plate manufacturing process apparatus of the present invention, sufficient line tension can be applied without worrying about transfer to the steel plate. It is possible to operate with full production capacity. For this reason, while the production capacity of a steel plate is fully exhibited, the surface quality of the steel plate produced can be conveyed with a high state maintained. In addition, a significant cost reduction effect can be expected due to a decrease in the frequency of replacement of the transport roll due to the difference in surface hardness and the accompanying deformation of the weld surface, and the cost and replacement of the transport roll used in many steel sheet manufacturing processes. Maintenance costs when it becomes necessary can be reduced.

<Others>
In addition, this invention is not restricted to said Example, A various deformation | transformation and application are possible.

  In the present invention, the abutted state means a state in which the metal plate 12 faces each other with a gap between the butted left end surface 2a and the butted right end surface 2b narrowed.

  In the present invention, the state in which the gap is narrowed is a state in which the gap between the butted left end surface 2a and the butted right end surface 2b of the metal plate 12 is 0.8 mm or less, more preferably 0.5 mm or less. In a state where the gap between the butted left end surface 2a and the butted right end surface 2b is zero, the step between the butted left end surface 2a and the butted right end surface 2b of the metal plate 12 is 1.0 mm or less, more preferably 0.5 mm or less, More preferably, it means a state of zero.

1 ... Butting part,
2a ... the left end face
2b ... right end face
3a ... Machining device,
3a1 ... Straight end mill,
3b ... Machining device,
3b1 ... taper-shaped end mill,
3c ... Machining device,
4 ... Ring-type fixture,
5a ... Upper pressing bolt,
5b ... side pressing bolt,
5c ... Lower pressing bolt,
5d ... block,
5e ... (C-shaped) frame,
5f ... (ring-shaped) frame,
6 ... Arm type robot,
6a ... outer surface side laser beam welding head,
6b ... Inner surface side laser beam welding head,
6c ... Robot arm part,
7 ... C-type fixing jig,
8: Taper angle reference point,
9 ... Inner peripheral side groove processing part (V-shaped),
10 ... welding head,
11 ... groove welded part,
11a ... 1st welding layer,
11b ... second weld layer,
12 ... Cylindrical metal plate (before welding),
13 ... Cylindrical metal plate (after welding),
R: A plate bending hollow roll according to the present invention.

Claims (8)

After performing a plate bending process to bend the rectangular metal plate into a cylindrical shape, the end surfaces of both ends of the metal plate bent into the cylindrical shape are brought into contact with each other,
In this state, groove processing is performed on the inner peripheral side of both end portions that face each other to form a groove processing portion,
Applying machining to the end face on the outer peripheral side of the abutted both ends to smooth the end face,
After that, a pressing force is applied from the outer peripheral side to the cylindrical metal plate and the gap between the end faces of the both end portions is reduced,
In this state, without interposing a welding material between the end faces of the both ends, welding the both ends of the metal plate with a laser beam,
Thereafter, the inner peripheral groove processing portion is welded using a welding material, and the metal plate bent into the cylindrical shape is formed into a cylindrical shape. In the manufacturing method of the plate bending hollow roll of Claim 1,
The step of machining the end faces on the outer peripheral side of the abutted both ends,
The manufacturing method of the plate bending hollow roll characterized by forming the space | interval where the end surface whole surface is parallel between the end surfaces of the said both ends. In the manufacturing method of the plate bending hollow roll of Claim 1,
The step of machining the end faces on the outer peripheral side of the abutted both ends,
Forming the end surfaces of the abutted ends into a tapered shape with the outer peripheral side open so that the entire end surfaces of both ends become parallel when the gap formed between the end surfaces of the both ends is narrowed; The manufacturing method of the plate bending hollow roll characterized by these. In the manufacturing method of the plate bending hollow roll of any one of Claims 1-3,
A plate bending hollow roll manufacturing method, wherein welding using the laser beam and welding using the welding material are performed using an arm type robot. In the manufacturing method of the plate bending hollow roll of any one of Claims 1-4,
The step of performing welding using a welding material on the groove processing portion on the inner peripheral side,
Forming a first weld layer by performing low heat input welding on the groove processed portion;
A weld layer having a two-layer structure is formed on the groove processing portion by forming a second weld layer on the first weld layer by performing a large heat input welding having a larger heat input than the low heat input welding. A method for producing a plate-bending hollow roll, characterized in that: In the manufacturing method of the plate bending hollow roll of any one of Claims 1-5,
The step of applying a pressing force from the outer peripheral side to the metal plate bent into the cylindrical shape to make the gap between the end faces of the both ends narrow.
Production of a plate-bending hollow roll characterized in that the metal plate bent into a cylindrical shape is pressed from the outer peripheral side using a fixing jig provided with a pressing means so that the gap between the end faces of the both ends is reduced. Method.   The plate bending hollow roll manufactured using the manufacturing method of the plate bending hollow roll of any one of Claims 1-6.   The steel plate manufacturing process apparatus using the plate bending hollow roll manufactured using the manufacturing method of the plate bending hollow roll of any one of Claims 1-6.

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